Shynloco said:
Good Morning Guys,
Just saw this thread and not trying to hijack it. But since this is a learning moment and Cat has raised an issue that I've wondered about in the past AND oldwildhog mentioned it (that he can't shoot anything over 75gr bullets and Cat writes he has other issues); why is it that some rifles having a given barrel twist rate that is SUPPOSED to shoot bullets up to a certain gr weight, but won't go up to that level ((105's in this case) while the majority of barrels with the same twist rate WILL shoot up to that weight level?? Sorry for the long winded question guys but I've experienced what oldwildhog has (not in 6mm Rem) and always wondered why. Thx.
Alex
Alex... good "hijack"
Anyone that says they know why, is... well, you know
Burger has a program on their website that is supposed to calculate bullet stability. Now, there are certain combinations of velocity, twist, bullet weight and bullet design... that just plain, God damn work every time.
Like a .224 bore, 14" twist, 52gr hollow point, at 3,100, but Berger's program says it at the edge of unstable. Huh???
A lot of what people claim to be stable or not stable, is either myth, or based on the old Greenhill formulas that were derived from empirical data (trial and error, for you guys in Rio Linda) gathered from blunt nosed, lead bullets... and then tweaked.
A few years back, someone promoted the idea that the BC of a bullet shot from a light weight barrel was much less than when shot from a heavy barrel... and people were dumb enough to believe it. Huh???
Why a barrel of a given twist will not stabilize bullets of a specific design, when another barrel will shoot small groups with the same bullet is one of those things that I doubt we will ever know.
nastynatesfish said:
It's usually more the shape of a billet. The longer bullet contacts more surface. A bt bullet with a long nose will contact the same amount of rifling as a shorter flat base bullet.
A longer bullet of the same weight contacts LESS barrel, not more. A boat tail of the same weight contacts LESS barrel than a flat based bullet.
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The 244/6mm Remington obsolete???
Sure, just like the .220 Swift, and the.22 Hornet,